Abstract
Barium disilicide (BaSi2) has attractive features for thin-film solar cell applications. Differently from
CuGaInSe2 and CdTe thin-film solar cells, BaSi2 is composed of only safe, stable, and earth-abundant elements.
In this article, present status of BaSi2 solar cells research ranging from defect studies using photoluminescence,
electron paramagnetic resonance to passivation of defects by atomic hydrogen are presented.
We put emphasis on the importance of device structure using electron transport and hole
transport layers. BaSi2 solar cells will become market leaders if the energy conversion efficiency of
BaSi2 solar cells exceeds 20%.
